<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>event proxy</title>
</head>
<body>
  <div>
    <ul class="container">
      <li>1----------------</li>
      <li>2----------------</li>
      <li>3----------------</li>
      <li>4----------------</li>
    </ul>
  </div>
  <script>
    const uls = document.querySelector('.container')
    uls.addEventListener('click',e=>{
      // console.log(e.target.innerHTML)
      console.dir(e)
      const html = e.target.innerHTML
      const num = html.slice(0,1)
      console.log(num)
    })
  </script>
</body>
</html>